others taken from egypt, libya, after the fall of moammar gadhafi. but hamas remained vastly out-gunned by israel this is this is a big gamble for hamas, and many are paying with their lives. most are off the streets, we can hear the air raid drones, the inflaming the entire region. >> all right, richard engel in gaza tonight. one more thing, look at how social media has come into play. the israeli army is posting real time warnings when missiles are in the air, heading their way. hamas is also using twitter, but in this case, showing the rocket, and the message, sorry, we have been humiliated. >>> in this country, david petraeus snuck in and out of capitol hill today like a star witness at a hearing, which in fact, he was. the former four-star general, former cia director until a week ago tonight was hidden from view as he testified in secret about his old job and what he knows about what happened in benghazi, libya, on 911 of this year. nbc's kelly o'donnell has more. >> reporter: good evening, hearing from petraeus was so critical, not only becaus